User Guide

Contents
viii
AsyncOS 9.1.2 for Cisco Email Security Appliances User Guide
Policy Enforcement Filters 9-105
Routing and Domain Spoofing 9-109
Configuring Scan Behavior 9-112
CHAPTER 10 Mail Policies 10-1
Overview of Mail Policies 10-1
How to Enforce Mail Policies on a Per-User Basis 10-2
Handling Incoming and Outgoing Messages Differently 10-3
Matching Users to a Mail Policy 10-3
First Match Wins 10-4
Examples of Policy Matching 10-4
Message Splintering 10-5
Managed Exceptions 10-6
Configuring Mail Policies 10-7
Configuring the Default Mail Policy for Incoming or Outgoing Messages 10-7
Creating a Mail Policy for a Group of Senders and Recipients 10-7
Finding Which Policies Apply to a Sender or Recipient 10-10
CHAPTER 11 Content Filters 11-1
Overview of Content Filters 11-1
How Content Filters Work 11-1
How to Scan Message Content Using a Content Filter 11-2
Content Filter Conditions 11-2
Content Filter Actions 11-9
Action Variables 11-14
Filtering Messages Based on Content 11-16
Creating a Content Filter 11-16
Enabling Content Filters for All Recipients by Default 11-17
Applying the Content Filter to Messages for a Certain User Group 11-18
Notes on Configuring Content Filters in the GUI 11-18
CHAPTER 12 Anti-Virus 12-1
Anti-Virus Scanning Overview 12-1
Evaluation Key 12-2
Scanning Messages with Multiple Anti-Virus Scanning Engines 12-2
Sophos Anti-Virus Filtering 12-2
Virus Detection Engine 12-3
Virus Scanning 12-3